mmc: core: power-cycle sd card on error

Hardware reset is not implemented in SD card. To circumvent this,
a power-cycle is issued to the card & it is reinitialized.
This would help recovering from 'card stuck in programming state'
situations.

mmc_can_reset:	Added check for SD card.

CRs-fixed: 375869
Change-Id: I8bd7dc071f3569898371d5becca06ec2fe937d4a
Signed-off-by: Asutosh Das <asutoshd@codeaurora.org>